It was humanity?s first experience with ?total war.? The brutal six-year war that pitted Britain, the United States, the USSR and their allies against Nazi Germany, Imperial Japan, and their allies transformed Europe and the world. Tens of millions died, **t only in battle but through ge**cide. Six million Jews, along with millions of homo***uals, dissidents and other ethnic mi**rities, died in Nazi concentration camps. Whatever side you were on ? or if you were trying to save yourself ? secrecy was essential. Historians are just starting to resolve some of the war?s enduring mysteries. Let?s have a look.